Question 1

Which layer of a typical blood vessel wall is primarily responsible for vasoconstriction and vasodilation, and what is its main tissue type?

Accepted Answer

Tunica media; smooth muscle

Question 2

A patient presents with swelling in the lower limbs after prolonged standing. Which physiological mechanism most likely failed, and what is the resulting condition called?

Accepted Answer

Failure of venous valves; varicose veins

Question 3

Which type of capillary is most abundant in the kidneys and is specialized for filtration due to its structure?

Accepted Answer

Fenestrated capillary

Question 4

If the radius of a blood vessel doubles, how does the resistance to blood flow change, according to Poiseuille’s law?

Accepted Answer

Resistance decreases to 1/16 of the original value

Question 5

Calculate the mean arterial pressure (MAP) for a patient with a blood pressure of 150/90 mm Hg.

Accepted Answer

$$MAP = 90 + \frac{1}{3}(150-90) = 110 mm Hg$$

Question 6

Which of the following best describes the function of vascular anastomoses?

Accepted Answer

They provide alternate pathways for blood flow if one vessel is blocked.

Question 7

A patient with chronic hypertension is at increased risk for which of the following complications?

Accepted Answer

Stroke, heart failure, and renal failure

Question 8

Which hormone decreases blood pressure by antagonizing aldosterone and causing decreased blood volume?

Accepted Answer

Atrial natriuretic peptide (ANP)

Question 9

During exercise, blood flow to skeletal muscles increases dramatically. Which mechanism is primarily responsible for this redistribution?

Accepted Answer

Intrinsic metabolic controls causing vasodilation in muscle arterioles

Question 10

Which of the following equations correctly represents the relationship between blood flow (F), pressure gradient (ΔP), and resistance (R)?

Accepted Answer

$$F = \frac{\Delta P}{R}$$

Question 11

A patient is experiencing circulatory shock after a severe hemorrhage. Which type of shock is this, and what is the primary cause?

Accepted Answer

Hypovolemic shock; decreased blood volume

Question 12

Which of the following is a direct effect of increased capillary hydrostatic pressure?

Accepted Answer

Increased filtration of fluid into the interstitial space

Question 13

Which of the following best explains why veins are called capacitance vessels?

Accepted Answer

They contain most of the blood volume and can stretch to accommodate changes in blood volume.

Question 14

Which of the following would most likely result in edema?

Accepted Answer

Decreased plasma protein concentration

Question 15

Which of the following is true regarding the pulmonary circuit compared to the systemic circuit?

Accepted Answer

Pulmonary arteries carry deoxygenated blood, and pressure is much lower than in the systemic circuit.

Question 16

Which of the following mechanisms is responsible for the return of blood to the heart through the veins, especially from the lower limbs?

Accepted Answer

Muscular pump and venous valves

Question 17

A patient with a tumor that increases secretion of aldosterone would likely experience which of the following changes in blood pressure?

Accepted Answer

Increased blood pressure due to increased sodium and water retention

Question 18

Which of the following best describes the effect of nitric oxide (NO) released by endothelial cells?

Accepted Answer

It causes vasodilation, increasing blood flow to tissues.

Question 19

Which of the following is the correct formula for net filtration pressure (NFP) at a capillary bed?

Accepted Answer

$$NFP = (HP_c + OP_{if}) - (HP_{if} + OP_c)$$

Question 20

Which of the following would most likely occur if the mean arterial pressure (MAP) drops below 60 mm Hg in the brain?

Accepted Answer

Syncope (fainting) due to inadequate cerebral perfusion

The Cardiovascular System: Blood Vessels – Structure, Function, and Regulation

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